Explaining feminism to your
boyfriend is the same as explaining it
to anyone.

I think the best strategy is
to make it personal to their lives, for
instance, it helps them if you can pay
50/50 and saves them from having to deal
with your emotional volatility due to being
undervalued by society. Also most people
are affected by feminism, they are dealing
with discrimination directly or through
a loved one, and so I think it just takes
you figuring out what that is and making
those connections for them.

I have also
been lucky that most of my boyfriends are
naturally feminist and actually the more
I pushed the more they resisted. I had
more luck when I just trusted their instincts
and let them be feminist rather than have
me micro-manage it. Good luck,